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Correlations of medium physical properties and process performance in solid-state fermentation
Zhang, Yuzhen1,2; Wang, Lan1; Chen, Hongzhang1

The medium of solid-state fermentation (SSF) is a multiphase system, whose complex physical properties cause difficulties of the cognition of SSF process and the process control. This paper aimed to deeply analyze the mechanical, structural and thermal properties of solid-state medium, explored relationships between the medium's physical properties and fermentation performance, then to guide the process control and culture medium optimization for SSF. A mechanical property index (I-mp), which was the product of resilience, cohesiveness, and springiness, was established to fully characterize physical properties of medium. Results showed at the initial stage of SSF, there were positive correlations of I-mp with thermal conductivity and water retention, negative correlations with gas permeability and thermal diffusivity, and a parabolic relationship with biomass content with a symmetry-axis at I-mp = 4.37 x 10(-2). Correlations were further verified in SSF dynamic process. During the first 100 h, I-mp <= 4.37 x 10(-2) was positively correlated with heat conduction and water retention in medium, which was beneficial for cell growth; while when I-mp > 4.37 x 10(-2) during 100-168 h, medium heat accumulation, poor heat diffusivity and poor gas permeability indicated the reduction of fermentation performance. Results revealed medium physical properties significantly affected heat and mass transfer and further influenced fermentation performance in SSF. Mechanical property index I-mp could well comprehensively characterize physical properties of medium, which could be useful for guiding initial culture medium preparation and SSF process control. (C) 2017 Elsevier Ltd. All rights reserved.

KeywordSolid-state Fermentation Physical Properties Heat And Mass Transfer Fermentation Performance Mechanical Properties
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS KeywordSubstrate Fermentation ; Sugarcane Bagasse ; Forced Aeration ; Tray Bioreactor ; Water Activity ; Particle-size ; Wheat Bran ; Optimization ; Xylanase ; Temperature
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationOpen Funding Project of the State Key Laboratory of Biochemical Engineering(2013KF-01 ; 2015KF-04 ; 2015KF-05)
WOS IDWOS:000399489200007
Citation statistics
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Yuzhen,Wang, Lan,Chen, Hongzhang. Correlations of medium physical properties and process performance in solid-state fermentation[J]. CHEMICAL ENGINEERING SCIENCE,2017,165:65-73.
APA Zhang, Yuzhen,Wang, Lan,&Chen, Hongzhang.(2017).Correlations of medium physical properties and process performance in solid-state fermentation.CHEMICAL ENGINEERING SCIENCE,165,65-73.
MLA Zhang, Yuzhen,et al."Correlations of medium physical properties and process performance in solid-state fermentation".CHEMICAL ENGINEERING SCIENCE 165(2017):65-73.
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